Calendar Books Mulitplying

Is anyone else having problems with their calendar books on their blackberry devices multiplying?
It seems it only happens to the devices we have updated with current software from Blackberry that is giving us multiple calendar books which causes multiple contacts and it starts to eat up memory.

We saw duplicate calendars on devices with Blackberry OS 4.3. Upgrading to 4.5 fixed the issue. We're currently seeing duplicate address books with Blackberry OS 4.5 and 4.7. Our older Blackberries on OS 4.2 have never had a duplicate address book or calendar.

Same here

Yes, we are only seeing the multiplying in the upgraded blackberry's above 4.5. Zimbra has a patch but we see that release 6 will not be released until June but we have not found a work around to stop the contact books from multiplying yet.